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Mode Parameter Pages
Mode Page Representation
Square brackets [ ]
Round brackets ( )
Mode Data Format
1
3
74
Commands
key is set to
UNIT ATTENTION
parameters changed).
Mode data is recovered from the drive by means of a
After modification, it is returned to the drive via a
real-life, many hosts do not use
data suits them into the drive.
Certain conventions are used in the following Mode Parameter pages in order
to describe the nature of the parameters. Most parameters are given by name,
followed by a number in brackets. The brackets have the following meanings:
Square brackets indicate that the parameter may be modified. The number inside the
brackets is the default value for the field—in other words, the power-up or reset value.
M
may modify this value by sending the page with a new value
ODE SELECT
in the field.
M
(current values) will return the current value of the parameter.
ODE SENSE
M
(default values) will return the value in brackets [].
ODE SENSE
M
(changeable values) will return a value of all ones.
ODE SENSE
Round brackets indicate that the parameter is fixed. The number inside the brackets is
the fixed value for the field.
M
must set the parameter to this value, otherwise
ODE SELECT
will be reported with a sense key of
CONDITION
M
(default values) will return the fixed value.
ODE SENSE
M
(changeable values) will return a value of all zeros.
ODE SENSE
Mode data consists of a 4-byte header, optionally followed by block descriptor
and Mode Parameter pages:
7
6
(MSB)
. Additional sense is set to 2A01h (mode
Mode Sense
5
4
3
Mode Parameter Header
Mode Sense
command. In
Mode Select
and return whatever
Mode Select
CHECK
ILLEGAL REQUEST
2
1
command.
.
0
(LSB)
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